The purpose of the service business district is to provide land for sales, service and repair establishments which require highway orientation or large tracts of land not normally available in central and local business districts; do not contribute to the design of a unified business center, depend on drive-in business; and require a location along or near major thoroughfares and intersections. Major retail and office businesses and residential are permitted as a conditional use. Other commercial and industrial development may be introduced under the planned unit development approach. Central water and sewer facilities are required.